in no case
Under no condition or circumstances; by no means; never. The defendant has a long history of violent, psychopathic behavior and should be in no case allowed to remain free. I will in no case allow my company to fall into the hands of someone like you!
in no case
Never, under no circumstances, as in She should in no case be told that he has a terminal illness. [First half of 1400s] For an antonym, see in any case.